Table 1.

Distance between helix pairs (with ePepN residue numbers in parentheses) in domain IV of F3 relative to their position in ePepN

Helix pair	Displacement of helix pair, Å
	F3 closed	F3 intermediate	F3 open
α14–α15 (672–706)	7.6	9.0	11.9
α16–α17 (710–740)	8.6	10.8	14.5
α18–α19 (761–792)	7.9	10.1	14.4
α20–α21 (803–836)	12.9	13.5	16.3
α22–α23 (838–870)	18.3	14.7	21.0

Distances were calculated after superimposing domains I and II of F3 on the corresponding domains in ePepN.